Curling Corners on Upper Layers (1 reply)

Hi All,

I am having an odd problem printer the 20mm calibration cube. Everything adheres to my heated bed OK and I get no curling on the lower layers. However as the build goes higher the corners start curling up a little. This becomes more exaggerated as more height is added.

Can anyone give me a clue as to what would cause this and how to counter it? I will state again that this is not the 'typical' curling issue of lower layers, but curling of upper layers as the build progresses.

Thanks

Andy